ICS23.040.40 ISBN978-974-292-343-3 THAI INDUSTRIAL STANDARD . 21962547ISO 4144 : 2003PIPEWORK STAINLESSSTEELFITTINGSTHREADEDINACCORDANCEWITH ISO71 ISO 71 ISO 71 6 10400 0 2202 3300 123 27 16 2549. 21962547(2) 15 .. 2511 ISO 71 ISO4144:2003PipeworkStainlesssteelfittingsthreaded in accordance with ISO 71 (identical) ISO (3) 3456( .. 2548 ) .. 2511 ISO 71 15 .. 2511 ISO 71 . 21962547 29 .. 2548 1 . 2196 2547ISO 4144 : 2003 ISO 7-1 ISO 4144 : 2003 Pipework Stainless steel fittingsthreaded in accordance with ISO 7-1 (identical) ISO (pressuretemperature rating) ISO7-1 ISO 7-1, Pipe threads where pressuretight joints are made on the threads Part 1 : Dimensions,tolerances and designationISO 7-2, Pipe threads where pressuretight joints are made on the threads Part 2 : Verificationby means of limit gaugesISO 68-1, ISO general purpose screw threads Basic profile Part 1 : Metric screw threadsISO 228-1, Pipe threads where pressuretight joint are not made on the threads Part 1 : Dimensions,tolerances and designationISO 261, ISO generalpurpose metric screw threads General planISO 262, ISO generalpurpose metric screw threads Selected sizes for screws, bolts and nutsISO 724, ISO generalpurpose metric screw threads Basic dimensionsISO4990, Steel castings General technical technical delivery requirementsISO 4991 : 1994, Steel castings for pressure purposes ISO 4144 : 2003 3 2 . 2196 2547ISO 4144 : 2003 ISO 4144 : 2003 4 ISO 4144 : 2003 5 ISO 4144 : 2003 6 ISO 4144 : 2003 7 ISO 4144 : 2003 8 ISO 4144 : 2003 9 ISO 4144 : 2003 10 3 . 2196 2547ISO 4144 : 20031Pipework Stainless steel fittings threaded in accordance with ISO 7-1 1Scope ThisInternationalStandardspecifiesthetypes,pressure-temperatureratings,minimumdimensionsand materialsofstainlesssteelfittingsforthreadedconnectionsinaccordancewithISO 7-1,usedforordinary piping for steam, air, gas, water, oil, etc. 2Normative references Thefollowingreferenceddocumentsareindispensablefortheapplicationofthisdocument.Fordated references,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenced document (including any amendments) applies. ISO 7-1, Pipe threads where pressure-tight joints are made on the threads Part 1: Dimensions, tolerances and designationISO 7-2, Pipe threads where pressure-tight joints are made on the threads Part 2: Verification by means of limit gauges ISO 68-1, ISO general purpose screw threads Basic profile Part 1: Metric screw threadsISO 228-1,Pipethreadswherepressure-tightjointsarenotmadeonthethreadsPart 1:Dimensions, tolerances and designationISO 261, ISO general-purpose metric screw threads General planISO 262, ISO general-purpose metric screw threads Selected sizes for screws, bolts and nutsISO 724, ISO general-purpose metric screw threads Basic dimensionsISO 4990:1), Steel castings General technical delivery requirementsISO 4991:1994, Steel castings for pressure purposes 1)To be published. (Revision of ISO 4990:1986) 4 . 2196 2547ISO 4144 : 200323Types of fittings and their symbols Table 1 shows 12 types of fittings and their symbols. Table 1 Types of fittings and their symbols DiagramTypeSymbolFigure Elbows,equal and reducing E1 and E22 and 3 45 elbowsE34 Male and female elbowsE45 Tees, equal and reducingT1 and T22 and 3 CrossesX12 Half socketsS16 Sockets,equal and reducing S2 and S37 and 8 Reducing bushesB19 Hexagon nipples, equal and reducing N1 and N210 and 11 CapsC112 PlugsP1 and P213 Unions U1, U2, U3 U4, U5, U6 14 5 . 2196 2547ISO 4144 : 200334Pressure-temperature ratings Pressure-temperature ratings are indicated in Table 2. Table 2 Pressure-temperature ratings TemperatureNon-shock maximum working pressure Cbar 20 to 402010016,5 15015 20014 22013,5 NOTE 1Pressure for intermediate temperatures may be determined by the interpolation method. NOTE 2Temperatures indicated are those of internal fluid. NOTE 3Piping loads, stresses and moments are not taken into account. 5Manufacturing and materials Fittingsshallbemanufacturedfromcastings,rolling,forging,etc.Materialshallbeausteniticstainlesssteel havingtheproofstressatleastequaltothatofsteelTS 47specifiedinISO 2604-2.Fittingsshallbemade frommaterialsthathavebeenproperlyheattreatedbythesolution-annealingmethodspecifiedin ISO 4991:1994, 5.2, Table 1. 6Threads 6.1Choice of thread ThreadsinfittingsshallbeinaccordancewithISO 7-1.Externalandinternalthreadsaretapered1:16,but internal threads may be parallel. Exceptions:Union-nutsandtheirmatingthreadsshallbeinaccordancewithISO 68-1,ISO 228-1,ISO 261, ISO 262 or ISO 724. 6.2Chamfering Thread ends should be chamfered. 7Dimensions 7.1General Dimensions are showninFigures 1 to 14and specified in Tables 3 to 16. Unspecified dimensions are at the discretion of the manufacturer. 6 . 2196 2547ISO 4144 : 200347.2Dimensions of joints See Figure 1 and Table 3. Figure 1 Dimensions of joints Table 3 Dimensions of joints Thread sizeNominal diameter Minimum outside diameter of internal threadsaMaximum inside diameter of external threadsbMinimum wall thicknesscDN Ddtmmmmmm 1/8 613,05,51,5 1/4 816,58,01,5 3/8 1020,011,51,5 1/2 1524,515,01,6 3/4 2030,020,51,7 1 2537,526,01,9 1 1/43246,534,52,2 1 1/24053,040,02,4 2 5065,551,02,7 2 1/26582,065,53,2 3 8095,577,53,6 4 100121,5101,54,1 aD is equal to the major diameter of the internal thread at the gauge plane plus 2t and rounded up to 0,5 mm. bd is equal to the minor diameter of the external thread at the gauge plane minus 2t and rounded down to 0,5 mm. cThe wall thickness of fittings made of a material other than casting material may be reduced to 0,8t. 7 . 2196 2547ISO 4144 : 200357.3Elbows E1, tees T1 and crosses X1 See Figure 2 and Table 4. Figure 2 Elbow E1, tee T1 and cross X1 Table 4 Dimensions of elbows E1, tees T1 and crosses X1 Threaddiameter Nominal diameter DNaminmm 1/8 617 1/4 819 3/8 1023 1/2 1527 3/4 2032 1 2538 1 1/43245 1 1/24048 2 5057 2 1/26569 3 8078 4 10096 8 . 2196 2547ISO 4144 : 200367.4Reducing elbows E2 and reducing tees T2 See Figure 3 and Table 5. Figure 3 Reducing elbow E2 and reducing tee T2 Table 5 Reducing elbows E2 and reducing tees T2 Nominal diametersa aminbminThread size DN1DN2(1)(2)mmmm 1/41/8861818 3/81/41082022 1/4 82424 1/23/815102625 3/8 102828 3/41/220152930 1/2 153233 13/425203435 3/4 203840 1 1/4 132254042 1 254145 1 1/2 1 1/4 40324548 1 1/4324854 21 1/2 50405255 1 1/2405562 2 1/2 265506065 2 506272 32 1/2 80657275 2 1/2657890 43100808391 aDN1 shows nominal diameter of larger side and DN2 shows nominal diameter of smaller side. 9 . 2196 2547ISO 4144 : 200377.545 elbows E3 See Figure 4 and Table 6. Figure 4 45 elbow E3 Table 6 Dimensions of 45 elbows E3 Thread size Nominal diameter DNaminmm 1/8 616 1/4 817 3/8 1019 1/2 1521 3/4 2025 1 2529 1 1/43233 1 1/24037 2 5042 2 1/26549 3 8054 4 10064 10 . 2196 2547ISO 4144 : 200387.6Male and female elbows E4 See Figure 5 and Table 7. Figure 5 Male and female elbow E4 Table 7 Dimensions of male and female elbows E4 Thread size Nominal diameter DNaminbminmmmm 1/8 61726 1/4 81927 3/8 102329 1/2 152735 3/4 203240 1 253846 1 1/4324554 1 1/2404857 2 505770 2 1/2656983 3 807894 4 10097115 11 . 2196 2547ISO 4144 : 200397.7Half sockets S1 See Figure 6 and Table 8. Figure 6 Half socket S1 Table 8 Dimensions of half sockets S1 Thread size Nominal diameter DNlminmm 1/8 67,5 1/4 811 3/8 1011,5 1/2 1515 3/4 2016,5 1 2519,5 1 1/43221,5 1 1/24021,5 2 5026 2 1/26530,5 3 8033,5 4 10039,5 12 . 2196 2547ISO 4144 : 2003107.8Sockets S2 See Figure 7 and Table 9. Figure 7 Socket S2 Table 9 Dimensions of sockets S2 Thread size Nominal diameter DNlminmm 1/8 617 1/4 824 3/8 1025 1/2 1532 3/4 2035 1 2541 1 1/43245 1 1/24045 2 5054 2 1/26563 3 8069 4 10081 13 . 2196 2547ISO 4144 : 2003117.9Reducing sockets S3 See Figure 8 and Table 10. Figure 8 Reducing socket S3 Table 10 Dimensions for reducing sockets S3 Nominal diametersalminThread size DN1DN2(1)(2)mm 1/41/88625 1/8 63/81/4108261/4 81/23/81510343/8 103/41/22015361/2 1513/42520423/4 201 1/4 13225481 251 1/2 1 1/4 4032521 1/43221 1/2 5040581 1/2402 1/2 26550652 5032 1/2 8065722 1/265431008094aDN1shows nominal diameter of larger side and DN2 shows nominal diameter of smaller side. 14 . 2196 2547ISO 4144 : 2003127.10Reducing bushes B1 See Figure 9 and Table 11. Reducing bushes B1 can have a hexagonal shape up to size 1/2, hexagonal or octagonal shape for size 3/4 through 2, hexagonal, octagonal or decagonal shape for size 2 1/2 through 4. Figure 9 Reducing bush B1 Table 11 Dimensions of reducing bushes B1 Nominal diametersalminmminThread size DN1DN2(1)(2)mmmm 1/41/88610,54 1/8 63/81/4108115 1/4 81/23/8151014,55 3/8 103/41/2201515,55,5 1/2 1513/42520186 3/4 201 1/4 1322520,56,5 1 251 1/2 1 1/4 403220,56,5 1 1/43221 1/2 5040257 1 1/2402 1/2 26550277 2 5032 1/2 8065307,5 2 1/2654310080368 aDN1 shows nominal diameter of larger side and DN2 shows nominal diameter of smaller side. 15 . 2196 2547ISO 4144 : 2003137.11Hexagon nipples N1 See Figure 10 and Table 12. Nipplescanhaveahexagonalshapeuptosize1/2,hexagonaloroctagonalshapeforsize3/4through2, hexagonal, octagonal or decagonal shape for size 2 1/2 through 4. Figure 10 Hexagon nipple N1 Table 12 Dimensions of hexagon nipples N1 Thread size Nominal diameter DNlminmminmmmm 1/8 684 1/4 810,54 3/8 10115 1/2 1514,55 3/4 2015,55,5 1 25186 1 1/43220,56,5 1 1/24020,56,5 2 50257 2 1/265277 3 80307,5 4 100368 16 . 2196 2547ISO 4144 : 2003147.12Reducing nipples N2 See Figure 11 and Table 13. Reducing nipples N2 can have a hexagonal shape up to size 1/2, hexagonal or octagonal shape for size 3/4 through 2, hexagonal, octagonal or decagonal shape for size 2 1/2 through 4. Figure 11 Reducing nipple N2 Table 13 Dimensions of reducing nipples N2 Nominal diametersal1 minl2 minmminThread size DN1DN2 (1)(2)mmmmmm 1/41/88610,584 1/8 68 3/81/41081110,551/4 810,5 1/23/8151014,51153/8 1011 3/41/2201515,514,55,51/2 1514,5 13/425201815,563/4 2015,5 1 1/4 1322520,5186,51 2518 1 1/2 1 1/4 403220,520,56,51 1/43220,5 21 1/2 50402520,571 1/24020,5 2 1/2 26550272572 5025 32 1/2 806530277,52 1/26527 431008036308aDN1 shows nominal diameter of larger side and DN2 shows nominal diameter of smaller side. 17 . 2196 2547ISO 4144 : 2003157.13Caps C1 See Figure 12 and Table 14. Caps may be round, hexagonal, octagonal or decagonal at the discretion of the manufacturer. aThe minimum wall thickness, t, of caps shall be no less than the minimum wall thickness requirements of Table 3. Figure 12 Caps C1 Table 14 Dimensions of caps C1 Thread sizeNominal diameter DNl1 minl2 minmmmm 1/8 612,510,5 1/4 81614 3/8 1016,514,5 1/2 152118,5 3/4 2022,519,5 1 252622,5 1 1/4322925,5 1 1/2402925,5 2 5033,530 2 1/26538,535 3 804238,5 4 10048,545 18 . 2196 2547ISO 4144 : 2003167.14Plugs P1 and P2 See Figure 13 and Table 15. Plugs may be solid or hollow at the discretion of the manufacturer. P2 may be hexagonal shape up to size 1/2, hexagonal or octagonal shape for size 3/4 through 2, hexagonal, octagonal or decagonal shape for size 2 1/2 through 4. Figure 13 Plugs P1 and P2 Table 15 Dimensions of plugs P1 and P2 Thread size Nominal diameter DNl1 minnminl2 minmminmmmmmmmm 1/8 66584 1/4 88,5510,54 3/8 1096115 1/2 1511,5714,55 3/4 2013815,55,5 1 2514,511186 1 1/432171120,56,5 1 1/240171220,56,5 2 5021,513257 2 1/26523,515277 3 8026,515307,5 4 10032,519368 19 . 2196 2547ISO 4144 : 2003177.15Unions with flat seat U1, U2 and U3 and unions with taper seat U4, U5 and U6 See Figure 14 and Table 16. Union nuts may be hexagonal, octagonal or decagonal at the discretion of the manufacturer. The minimum wall thickness of the union nut at any point shall be no less than the minimum wall thickness requirements of Table 3. aThe type of joint (flat or taper) is at the discretion of the manufacturer. Figure 14 Unions with flat seat U1, U2 and U3 and unions with taper seat U4, U5 and U6 Table 16 Dimensions of unions with flat seat U1, U2 and U3 and unions with taper seat U4, U5 and U6 Thread size Nominal diameterDNl1 minl2 minmminmmmmmm 1/8 630813 1/4 833,510,513,5 3/8 1036,51115 1/2 1539,514,516 3/4 2042,515,517 1 25501820 1 1/4325420,522 1 1/2405820,524 2 50652527 2 1/265752729,5 3 80833031 4 1001103634 20 . 2196 2547ISO 4144 : 2003188Tests and inspections 8.1The following inspections shall be performed visually:a)innerandoutersurfacesoffittingaresmooth,withnocracks,harmfulscratches,burrs,sandmarksor other defects; b)fully threaded parts of fittings are sound, with no thinned and nicked or other defects. 8.2InspectionsofthreadsoffittingsshallbeinaccordancewithISO 7-2orshallbecarriedoutbyother suitable means. 8.3The axes of screw threads shall be accurate within 0,5 of the specified angle. 8.4When inspecting the fittings in production, the following test shall be performed on each fitting to ensure thatnoleakageoccurs.Totestfittings,threadedendsaresealedand,afterpressurizingtheinsideofthe fittingstoairpressureof6 bar,thefittingsshallbeobservedforthetimeindicatedinTable 17while maintaining the pressure.Table 17 Minimum test duration Thread sizeMinimum test duration su 2 15W 2 1/2608.5A hydraulic test may be performed at 30 bar, instead of an air pressure test. The test method and test duration should be in accordance with 8.4. 8.6Aleakageinspectionisnotrequiredforfittingsmadefrommaterialssuchasforgings,rolledbarsor extruded tubes.8.7Fittingsshallbecapableofpassinganintergranularcorrosiontestperformedinaccordancewith ISO 4990:, B.9.1. When testing is performed, one fitting from each heat treatment charge shall be tested. 9Marking Fittings shall be marked with the trademark, material symbol or abbreviation and thread designation. However, marking may be omitted when there is insufficient space. 10Designation The fittings complyingwith this International Standard shallbedesignatedbythe following particulars,in the sequence shown: a)type of fitting; b)reference to this International Standard, i.e. ISO 4144; c)designation of thread size; d)symbol (see Table 1); 21 . 2196 2547ISO 4144 : 200319e)material. EXAMPLE 1An equal female elbow E1, with Rc 2 internal conical thread of grade TS 47 is designated as follows: Elbow ISO 4144-Rc2 E1 TS 47 EXAMPLE 2 AreducedteewithrunT2,withRc 2internalconicalthreadandbranch1 1/4ofgradeTS 61is designated as follows:Reduced tee ISO 4144-Rc 2 1 1/4 T2 TS 61